Ditsy,
Look at what you wrote on a previous message... " Parents married Oct 1845..." . Earlier you had written "... married January 1845.. "

?
And Elixabeth ( was she just registered "Elizabeth" ? ) was born in Church St, Gateshead and her dad registered her birth, stating his address as Church St.... which fits.. Yes ?
What was time gap between the date of her birth and the date of registration ?
Two male witnesses at a wedding in that era is not unusual... in an Anglican Church. But sometimes the witnesses were more "connected" to the church, than to the marrying couple !
Right, are your certificates "real" copies of the original registers, or are they handwritten or typewritten extractions raken from the registers ( you might be able to tell by say looking at how many different styles of handwriting... on a marraige cert there would be at least five.. assuming they could sign... two spouses two wits and clergyman ?. A modern-day copy might be only one person's handwriting.
Michael Dixon